package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j

public class AutoFillAspect {
    //
    //切入点
    //
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){

    }
    @Before("autoFillPointCut()")
    public void AutoFill(JoinPoint joinPoint) throws NoSuchMethodException {
        log.info("开始进行公共字段的自动填充..");

        //获取到被拦截的方法上的数据库操作类型
        MethodSignature signature= (MethodSignature)  joinPoint.getSignature();//方法签名对象
        AutoFill autoFill =  signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType=autoFill.value();//获取数据库操作类型
        //获取到当前被拦截的方法对的参数--实体对象
        Object[] args =joinPoint.getArgs();
        if (args ==null|| args.length == 0){
            return;
        }

        Object entity =args[0];

        //准备赋值的数据
        LocalDateTime now =  LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前的不同操作类型，为对应的属性通过反射来赋值
        if(operationType == OperationType.INSERT){
            //为4个公共字段赋值
            try {
            Method setCreateTime= entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
            Method setCreateUser =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
            Method setUpdateTime =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
            Method setUpdateUser =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

            //通过反射为对象赋值
            setCreateTime.invoke(entity,now);
            setCreateUser.invoke(entity,currentId);
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
            } catch (Exception e ) {
               e.printStackTrace();
            }

        }else if (operationType == OperationType.UPDATE){
            //为2个公共字段赋值
            try {
                Method setUpdateTime =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser =  entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                //通过反射为对象赋值

                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e ) {
                e.printStackTrace();
            }
        }

    }
}
